Platen printing press



Ma 1927. l 628 816 y 17, P, WIEGHARD PLATEN PRINTING PRESS Filed Dec. 5. 1925 2 Sheets-Sheet 2 machine. it has already Patented May 17, 1927.

UNITED STATES PATENT OFFICE.

PAUL 'WIEGHARDT, OF MAGDEBUEG, GERMANY, ASSIGNOR TO THE FIRM FRIED.

KR'UPP GRUSONWERK AKTIENGESELLSCHAFT, E MAGDEBURGBUCKAU, GER- MANY.

Application filed December 5, 1925, Serial No. 73,362, and in Germany December 24, 1924.

The subject matter of the present invention consists in a particular construction of a platen printing press, such as |1S known per se, and used for the printing of linoleum and other materials suitable for floor coverings.

In connection with machines of the type in which a series of printing couples is arranged to print successively the material which is intermittentl fed through the con proposed to provide mechanisms enabling the material to be printed with variously combined deslgns. These mechanisms which effect successively the throwing into or out of operation of the printing couples in accordance with the particular details of the design commonl consist of controlled suspension hooks, wlnc i in one position seize the printing cou le and in the other position release them. or the control of the said hooks, variously shaped cams have been employed,which are of such configurations that in their development the desired throwing into or out of operation of the printing couples is effected.

In contra-distinction from these hitherto known mechanisms, the present invention provides that the throwing into or out of operation of the printing couples shall be effected by the intermittent rotation of circular discs which at their circumference are formed with axially projecting rims, adapted to seize or release the printing couples in accordance with the angular position of the discs.

The drawings illustrate by way of example the construction of two printing couples of a fiat bed printing press provided with mechanism and actuating gear for intermittent rotation of the discs, according to the invention.

- Figure 1 represents the two printing couples with actuating gear in elevation.

Figure 2 is a cross section of a printing couple.

Figures 3 and 4 illustrate the mechanism and actuating gear on an enlarged scale.

Figure 5 illustrates an example of a print ing design.

The printing couples (Figures 1 and 2) consist mainly of the beam 1. the printing plate carriers 2, the printing plate 3, the vertically reciprocating rams 4 provided with adjustable roller brackets 5 and rollers ('i, and the connecting means J and 8 with bolts 9.

When the driving shafts 10 are rotated the printing couples are raised and lowered by the co-operation of the rollers 6, with the cam discs 11, keyed to the shafts 10 and with the cams 12 secured thereto, whereby the rams 4 are guided in the guides 13 and 1 1. The flanking devices, as well as the mechanisms for intermittently feeding the material through the machine, not forming part of the invention and not differing from known devices, have been omitted in the drawings. The driving gear for the shafts 10 is indicated, but requires no further description for similar reasons.

In order to enable a material intermittently advancing through the machine to be printed with a pattern composed of a series of strips which oin up in known manner into a continuous design, repeating itself in predetermined sequcnce or at predetermined distances, instead of with a sequence of identical patterns, the present invention provides each printing couple with a mechanism, which comprises the discs 16 and 17 keyed on the shaft and provided with rims 1.8

to co-operate with hooks 19 fitted with rollers 20. The actuating gear, illustrated in this constructional example, to impart intermittent rotation to the discs 16 and 1.7, consists of the ratchet wheels 21, the cranks 22 carrying the pawls 23 and the striker bar 24:.

This intermittent rotation of the discs 16 and 17, by means of the actuating gear shown in the drawings, is effected in the following manner.

The striker bar 24 is actuated from the main driving gear so that it performs a complete reciprocatory movement to each revolution to the shafts 10. In every movement towards the left. hand side the cranks 22, operatively connected with the striker bar 24, cause by means of the pawls 23, the ratchet wheels 21 to be advanced one tooth. This actuation. is effected during the period of rest of the printing couples in their top positions and causes the printing couples to be thrown out of operation in all positions in which the roller of the hook 19 is supported by the rim 18 as shown in Figure 3; in the other positions, the printing couple is not restrained.

Figure 5 shows an example of material printed with a design composed of a sequence of patterns, in which each design is formed by one strip A, six trips B and one strip 0; for the sake of simplicity it is assumed that the pattern is printed in a single colour. For printing a succession of one colour designs such as illustrated in Figure 5, a printing press, having three printing couples is required. l/Vhen the material is intermittently advanced for the width of a strip-which is illustrated in Fig. 5 at a reduced scalethe following conditions for the actuation of the three printing couples have to be fulfilled.

The first printing couple for the strip A, prints once, misses seven times, prints again once, misses seven times and so forth.

The second printing couple for the strip B, prints six times, misses twice, prints again six times, misses twice and so forth.

The third printing couple for the strip C,

I prints once, misses seven times, prints again once, misses seven times and so forth.

Figures 3 and 4 illustrate the controlling mechanisms for the first and second printing couple of a printing press with three printing couplesassuming Figure 1 to be ompleted by a third printing coupleto print a material with the design shown in Figure 5.

The mechanism shown in Figure 3 effects the throwing out of the printing couple in the positions II to VIII, only in position I is the printing couple released. The printing couple thus prints once and misses seven tiines and so forth as required for the printing of the strip A. The mechanism shown in Figure 4 effects the throwing out of the printing couple in the positions VIII and VII, in thepositions I to VI the printing couple is released. The printing couple thus prints six times, misses twice and so forth, as required for the printing of the strips B.

The ratchet wheels 21, cranks 22 with pawls 23 and striker bar 2& need be arranged at one side of the press only; at the other side of the press on the other end of the shafts 15 only the disc 17 is mounted as showninFigure 2, the disc 17 is thereby a counterpart of'disc 16.

Different ratchet wheels 21 and different discs 16 and 17 produce different results in the actuation of the printing couples. By providing the ratchet wheels 21 with a great er number of teeth, and employing'them in conjunction with varying rim discs 16 and 17, patterns having a varying munber of strips may be produced, always provided, however, that the number of teeth of the ratchet wheel 21 is a multiple of the number of strips. Thus for example, a ratchet wheel having 16 teeth. may in conjunction with correspondingly formed rim discs, be employed for patterns with 16, S or 4 strips. The rim discs for printing a pattern such as shown in Figure 5 would in such an event be adapted as follows:

Printing couple for strip A: positions I and IX without rim, positions II to VIII and X to XVI with rim.

Printing couple for strip ll: positions I to Vi and IX to XIV without rim. positions VII to VIII and XV to XVI with rim.

Instead of an actuating gear comprising a ratchet wheel 21, a crank 22 with a pawl 23 and a striker bar 24. any other actuating gear mav be employed, provided it adapt able to impart intermittent rotary movements to the discs 16 and 17.

I claim:

1. A. platen printing press with vertically reciprocating printing couples for printing materiais fed intermittently through the press with variably composed printing pat terns, ClltllZlCtGllZ(l by rotatable circular discs (16, 17) yurovided at their circumfei ence with axially projecting rims (.18) which according to the position oi the discs engage below members ('19, 20) secured on the print ing couple (1. to 9) and thereby hold the printing couple in its top position or release the said members and thereby allow the downward movement of the printing couple.

2. A platen printing press as claimed in claim 1 characterized by the factthat the discs (16) have secured to them ratchet wheels (21) which are intermittently rotated by means of an actuating gear.

3. A platen printing press according to claim 1 characterized by the fact that the discs have secured to them ratchet wheels (21) which are intermittently rotated by a reciprocating striker bar acting through cranks which, by means of pawls (23), advance the ratchet wheels (21) by one tooth at each stroke of the striker bar in one direction.

The foregoing specification signed at Berlin this 13th day of November. 1925.

PAUL IVI E I II A. R I) '1. 

